ALMA Observations of ρ-Oph 102: Grain Growth and Molecular Gas in the Disk around a Young Brown Dwarf

L. Ricci, L. Testi, A. Natta, A. Scholz, I. de Gregorio-Monsalvo

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

We present ALMA continuum and spectral line observations of the young brown dwarf ρ-Oph 102 at about 0.89 mm and 3.2 mm. We detect dust emission from the disk at these wavelengths and derive an upper limit on the radius of the dusty disk of ~40 AU. The derived variation of the dust opacity with frequency in the millimeter (mm) provides evidence for the presence of mm-sized grains in the disk's outer regions. This result demonstrates that mm-sized grains are found even in the low-density environments of brown dwarf disks and challenges our current understanding of dust evolution in disks. The CO map at 345 GHz clearly reveals molecular gas emission at the location of the brown dwarf, indicating a gas-rich disk as typically found for disks surrounding young pre-main-sequence stars. We derive a disk mass of ~0.3%-1% of the mass of the central brown dwarf, similar to the typical values found for disks around more massive young stars.
Original languageEnglish
Article numberL20
JournalAstrophysical Journal Letters
Volume761
Issue number2
Early online date30 Nov 2012
DOIs
Publication statusPublished - 20 Dec 2012

Keywords

  • brown dwarfs
  • circumstellar matter
  • planets and satellites: formation
  • stars: individual: ρ-Oph 102
  • submillimeter: stars

Fingerprint

Dive into the research topics of 'ALMA Observations of ρ-Oph 102: Grain Growth and Molecular Gas in the Disk around a Young Brown Dwarf'. Together they form a unique fingerprint.

Cite this